Lenovo 4XB7A77455 ST50 V2 3.5 S4520 480GB 6GB NHS SSD

Lenovo 4XB7A77455 ThinkSystem S4520 480GB 3.5" SATA SSD

Overview

The Lenovo 4XB7A77455 is a ThinkSystem S4520 Series 480GB SATA solid-state drive in a 3.5-inch hot-swap form factor, purpose-built for Lenovo server platforms including the ST50 V2. Where spinning disk introduces seek latency and mechanical failure risk into workloads that demand consistent I/O — think surveillance video indexing, database logging, OS boot volumes, or mixed read/write application tiers — this drive delivers a predictable, low-latency storage profile backed by a 2,000,000-hour MTBF rating. At 3W maximum draw, it integrates without adding meaningful thermal load to compact tower deployments.

Built on 3D TLC NAND flash with hardware-level AES 256-bit encryption, the 4XB7A77455 addresses both performance and data-security requirements in a single field-replaceable unit. S.M.A.R.T. monitoring support means your server management stack can track drive health proactively rather than discovering failure after the fact.

Key Features

• 480GB 3D TLC NAND capacity: 480GB provides enough headroom for OS + application + working dataset on a dedicated boot/app drive, while 3D TLC NAND stacks cells vertically to maintain density without sacrificing the endurance characteristics that enterprise mixed-use workloads require.
• 79,000 random read IOPS (4KB): At 79K 4KB random read IOPS, this drive handles the read-intensive I/O profile common in surveillance platform deployments — VMS index lookups, clip retrieval, concurrent stream playback — without the queue-depth stalls that plague mechanical drives under the same workload.
• 30,000 random write IOPS (4KB): 30K 4KB random write IOPS sustains continuous metadata and transaction logging at throughput levels that keep pace with multi-channel recording workloads. If your ST50 V2 is running a VMS backend, the write path won't be your bottleneck.
• AES 256-bit hardware encryption: Hardware-accelerated AES 256-bit encryption protects data at rest with no measurable CPU overhead. For regulated environments — healthcare video surveillance, financial branch offices, government facilities — this satisfies data-at-rest encryption requirements without a software encryption layer that would erode IOPS.
• 2,000,000-hour MTBF: A 2-million-hour mean time between failures rating reflects the reliability engineering behind commercial-grade SSD components. Translated to practical terms: this is a drive you can deploy in a 24/7 server environment and plan around scheduled refresh cycles, not unplanned failures.
• S.M.A.R.T. monitoring support: S.M.A.R.T. integration surfaces wear indicators, temperature thresholds, and reallocated sector counts to Lenovo XClarity and compatible management tools. You get advance warning of degradation before it becomes an outage — critical when the server is running a live surveillance or access control platform.
• 3W maximum power consumption: At 3W peak, this SSD draws roughly one-tenth the power of a comparable mechanical drive under load. In a densely populated ST50 V2 bay configuration, that reduction in per-drive thermal output matters for sustained operation within the enclosure's thermal envelope.
• 3.5-inch hot-swap form factor: The 3.5-inch large-form-factor carrier mates directly with ST50 V2 hot-swap bays — no adapter bracket required. Hot-swap capability means drive replacement during a maintenance window without powering down the server, reducing downtime exposure on always-on deployments.
• Operating temperature 0–70°C: A 0–70°C operating range accommodates server room environments that run warm or have intermittent HVAC. Storage temperature tolerance extends from -40°C to 75°C, so drives can be pre-staged or warehoused in uncontrolled environments without conditioning concerns.
• NHS (Non-Hot-Swap) designation: The NHS label in the part number indicates this unit ships without the hot-swap tray. If your ST50 V2 chassis requires a tray for bay installation, verify tray compatibility before ordering to avoid a second procurement step.

Integration and Compatibility

The 4XB7A77455 is designed for deployment in Lenovo ThinkSystem server platforms — specifically the Lenovo server and storage line including the ST50 V2 tower server. The SATA interface is a standard 6Gb/s connection compatible with the ST50 V2's onboard SATA controller. For integrators building out network video recorder solutions on Lenovo hardware, this drive serves as the primary OS or application volume, pairing with higher-capacity surveillance-grade HDDs for the recording tier. If you are architecting a storage-dense configuration, review the server storage category for compatible HDD and SSD options across supported capacities.

The AES 256-bit encryption capability operates at the drive controller level, independent of the host OS. Activation typically requires configuration through the server's UEFI/BIOS or storage management interface. Confirm your Lenovo XClarity or BIOS version supports SED (Self-Encrypting Drive) management before provisioning encrypted volumes in production.

For deployments requiring a storage planning baseline, note that at 30K random write IOPS this drive is suited for mixed-use and read-dominant workloads. Write-intensive applications such as high-bitrate multi-camera direct-to-disk recording at scale should pair this drive with a purpose-selected surveillance HDD tier rather than relying solely on SSD capacity.

Frequently Asked Questions

Q: What server platforms is the Lenovo 4XB7A77455 compatible with?

A: The 4XB7A77455 is designed for Lenovo ThinkSystem server platforms, including the ST50 V2. It uses a standard SATA 6Gb/s interface in a 3.5-inch form factor. Verify bay and controller compatibility against your specific server model's hardware maintenance manual before ordering.

Q: Does the 4XB7A77455 include a hot-swap tray?

A: No. The NHS designation in the part number stands for Non-Hot-Swap — the drive ships without a hot-swap tray. If your ST50 V2 chassis requires a tray for proper bay installation, you will need to source a compatible tray separately.

Q: What encryption does the 4XB7A77455 support?

A: The drive supports AES 256-bit hardware encryption at the controller level. This is a self-encrypting drive (SED) capability that operates without CPU overhead. Activation requires configuration through the server's UEFI/BIOS or a compatible storage management platform such as Lenovo XClarity.

Q: What are the IOPS specifications for the 4XB7A77455?

A: The drive delivers 79,000 random read IOPS and 30,000 random write IOPS at a 4KB block size. This profile suits read-dominant and mixed-use workloads such as OS boot volumes, VMS application tiers, and database logging — not write-intensive direct-to-disk recording at high bitrates.

Q: What is the MTBF rating on the 4XB7A77455?

A: The rated mean time between failures is 2,000,000 hours, reflecting a commercial-grade reliability specification appropriate for 24/7 server operation.

Q: What are the operating temperature limits for the 4XB7A77455?

A: The drive operates from 0°C to 70°C and can be stored from -40°C to 75°C. Relative humidity operating range is 5–95% (non-condensing).

James Everett

When I spec storage for a Lenovo ST50 V2-based surveillance server, the 4XB7A77455 is the drive I reach for when the application tier needs to stay on solid-state without inflating the power budget — 3W max draw on a 480GB SATA SSD is hard to argue with in a compact tower where every watt in the drive bays adds to the thermal ceiling.

Technical Highlights:

• 79,000 read IOPS / 30,000 write IOPS (4KB): The asymmetric IOPS profile tells you exactly what workload this drive is optimized for — read-heavy application and OS volumes. For a VMS platform running Milestone, Genetec, or Exacq on an ST50 V2, the OS and application tier sees predominantly read I/O after initial install; this drive handles that without queue saturation.
• AES 256-bit hardware encryption: Self-encrypting capability is table stakes for any regulated deployment — healthcare clinics, financial branches, government offices. Hardware-level AES means no IOPS penalty from software encryption layers, and the drive handles key management independently of the host OS.
• 2,000,000-hour MTBF: That reliability rating puts this drive in the class of components you schedule for refresh on a 5-year hardware lifecycle, not one you stock spares for preemptively. Paired with S.M.A.R.T. monitoring through XClarity, you get actionable health data rather than reactive failure response.

Deployment Considerations:

• The NHS (Non-Hot-Swap) designation is easy to overlook at order time. If the ST50 V2 chassis is configured for hot-swap bays, confirm whether a compatible Lenovo 3.5-inch tray is already installed in the target bay slot — or order it alongside this drive to avoid a delay on first installation.
• At 30K write IOPS this is a mixed-use drive, not a write-optimized one. Do not use it as the primary recording volume for high-bitrate multi-camera surveillance streams. Pair it with surveillance-rated HDDs for the recording tier and reserve this SSD for the OS, database, and application stack.

Best fit: ST50 V2 tower deployments in small-to-midsize commercial environments — a 32-camera retail site running a VMS on Lenovo hardware, a clinic with access control and video on a shared server, or a branch office where the entire physical security stack lives on one compact server. This drive handles the application layer; let the HDD tier handle the video storage.